Abstract
Methods developed by Jensen (1977, 1978) have been used to typify 50 lakes in Scania, S Sweden, according to their macrophyte composition. The macrophytic vegetation has been treated numerically both by classification programs (DIVINF, TABORD) and ordination programs (Reciprocal averaging, PCA). Characteristic cover (%), releve frequency (%) and transect frequency (%) for each species in each lake have been used in the numerical treatment. The values of the attributes have been transformed to a logarithmic scale: 100 (1+log Cover %). In the classification the species have been divided into two life forms (helophytes = H, nymphaeids = N) and a life-form group (elodeids, lemnids and Isoetids = ELI). Classifications have resulted in ten helophyte lake types, eleven ELI lake types and 6 nymphaeid lake types (fusion limit of similarity ratio = 0.80) and 3 helophyte, 5 ELI and 4 nymphaeid groups of lake types (fusion limit 0.30).
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